package io.renren.common.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DayBetween {
    /**
     * 计算时间相差的天数
     * @param smdate
     * @param bdate
     * @return
     * @throws ParseException
     */
    public static int dayBetween(Date smdate, Date bdate) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            smdate = sdf.parse(sdf.format(smdate));
            bdate = sdf.parse(sdf.format(bdate));
        }catch (Exception e){
            e.printStackTrace();
        }
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2= cal.getTimeInMillis();
        long between_days= (time2-time1)/(1000*3600*24);
        return Integer.parseInt(String.valueOf(between_days));
    }
}
